Shutter doors are a fairing to reduce drag and streamline the hull form when not in the process of launching torpedoes. The round door visible in your screenshot is the muzzle door. My internet is crappy right now so I can't upload a screenshot anywhere. But if you start a new mission and use the external camera you can see the shutter door open before the muzzle door when you order a tube opened.
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USS Kentucky SSBN 737 (G)
Comms Div 2003-2006
Qualified 19 November 03
Yes I was really on a submarine.
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